IC Timing Margin Measurement for Aging Failure Prediction
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Solution Overview
Problem
Integrated circuits (ICs) face challenges in predicting failures due to aging mechanisms such as hot-carrier injection, bias temperature instability, oxide breakdown, electromigration, stress migration, and random manufacturing defects, which can lead to performance degradation and catastrophic failures, making it difficult to incorporate effective safety factors during design.
Innovation Solution
A semiconductor integrated circuit (IC) with a signal path combiner, delay circuit, and comparison circuit that combines and delays signals to generate fingerprints, allowing for failure prediction through machine learning analysis and notification systems to mitigate failures before they occur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If safety factors are incorporated into IC design to account for manufacturing differences and aging, then reliability is improved, but the performance margin is reduced and device complexity increases
Solution Approach 1:
The patent applies preliminary action by measuring timing margins and detecting aging effects early in the IC's operational life, before failures occur. The system continuously monitors clock periods and compares them against reference values to detect degradation trends, enabling proactive maintenance before the safety factors are exhausted.
Solution Approach 2:
The patent implements feedback by continuously measuring the actual clock period of the IC, comparing it to reference clock periods, and using this information to detect aging effects. The feedback loop provides real-time data about timing margin degradation, allowing the system to adjust operation or alert users before failure occurs.
2Reliability
If continuous monitoring of IC performance is implemented to detect aging effects, then failure prediction capability is improved, but energy consumption and device complexity increase
Solution Approach 1:
The patent applies partial action by monitoring only specific critical timing parameters rather than continuously monitoring all IC operations. The system measures clock periods at key points in the data path and compares them against reference values, providing sufficient monitoring coverage with minimal energy expenditure.
Solution Approach 2:
The patent implements self-service by using the IC's own operational signals (clock periods) as the monitoring target. The system leverages existing signals already present in the IC during normal operation, eliminating the need for separate test signals or external monitoring equipment, thereby minimizing additional energy consumption.
3Measurement precision
If timing margin measurement circuits are added to detect degradation trends, then measurement precision is improved, but device complexity and area increase
Solution Approach 1:
The patent applies universality by designing the timing margin measurement circuit to serve multiple functions: it measures clock period, detects aging effects, predicts failures, and provides data for maintenance decisions. The same circuit infrastructure is used for both initial characterization and ongoing reliability monitoring, maximizing utility while minimizing complexity.
Solution Approach 2:
The patent uses copying by creating a reference clock period that replicates the expected timing characteristics of a healthy IC. The actual clock period is compared against this reference copy to detect deviations caused by aging, providing precise measurement without requiring complex analysis of the original signal.
4Reliability
If safety factors are increased to account for environmental and usage conditions, then reliability is improved, but the operational lifespan before performance degradation is reduced
Solution Approach 1:
The patent applies preliminary action by detecting aging effects early in the IC's operational life and providing advance warning before the safety factors are exhausted. This allows the system to extend operational lifespan by taking maintenance actions or reducing workload before the increased safety factors would normally limit performance.
Solution Approach 2:
The patent implements dynamics by adapting the IC's operational parameters based on real-time aging detection. The system can dynamically adjust clock speeds, workloads, or maintenance schedules based on the measured timing margins, allowing the IC to operate longer by optimizing performance throughout its lifecycle rather than being constrained by fixed safety factors.
Data Source
AI summary
A semiconductor integrated circuit (IC) comprising a signal path combiner, comprising a plurality of input paths and an output path. The IC comprises a delay circuit having an input electrically connected to the output path, the delay circuit delaying an input signal by a variable delay time to output a delayed signal path. The IC may comprise a first storage circuit electrically connected to the output path and a second storage circuit electrically connected to the delayed signal path. The IC comprises a comparison circuit that compares outputs of the signal path combiner and the delayed signal, wherein the comparison circuit comprises a comparison output provided in a comparison data signal to at least one mitigation circuit.